Tran, Lam, Hieu Le, Vinh Tran, and Van Tran. “Influence of SnO2 Concentration on the Structure and Optical Properties of Erbium Doped SiO2-SnO2 Ceramic Glass Thinfilms”. VNUHCM Journal of Science and Technology Development 17, no. 3 (September 30, 2014): 92-97. Accessed August 31, 2025. http://stdj.scienceandtechnology.com.vn/index.php/stdj/article/view/1374.